Satisfied? Nikon DK-17M magnifier on a D800/E.

Wondering is anyone with glasses, and wears them while shooting, is satisfied with the DK-17M magnifying eyepiece (1.2x) on their D800/E?

Does not seeing into the corners bother you? I guess one could always crop down a bit to what they did see while using one. I can see the green info screen without much of an issue, but the corners are pretty much a nice black vignette with my glasses on.

I'm debating on putting the original back on if I find I cannot get used to it in time, and other felt the same way using it. Right now, I feel I may end up cropping a lot more with it on. Dunno.